We recently installed a dual fuel oil furnace/heat pump system in our home. Along with the new system, the installer installed a Honeywell VisionPro IAQ thermostat (Model No. TH9421C1004). We've programmed the thermostat for 64 in the evening and 68 in the morning. As we understand it, the auxiliary oil heat should not come on until the outside temperature drops to 35 degrees.
The problem is that the auxiliary oil heat comes on whenever the inside temperature varies by more than 2 degrees (regardless of the outside temperature). The installer says its because this particular VisionPro model includes a "2 degree droop" function. We've had the installer out a couple of times to try and reprogram the thermostat; however, the problem continues.
Can someone help us with this problem?